I've had a flock of cliff swallows living here every breeding season for about the past 5 years (at least). They nest under the bridge that borders my property on the highway. By the time breeding season is over, their numbers are usually 60-100 strong. So far, I haven't seen them significantly impact my bee numbers. That being said, I don't use pesticides here, so there are also lots of butterflies, and bugs/insects of all varieties, so that helps.

they feed over my hives morning and night. there is nothing i can do about it. i did put stuff up to keep the bluejays off, but the swallows......

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.....The greatest changes occur in their country without their cooperation. They are not even aware of precisely what has taken place. They suspect it; they have heard of the event by chance. More than that, they are unconcerned with the fortunes of their village, the safety of their streets, the fate of their church and its vestry. They think that such things have nothing to do with them, that they belong to a powerful stranger called “the government.” They enjoy these goods as tenants, without a sense of ownership, and never give a thought to how they might be improved.....

Brenda, the birds that eat insects in this area are generally everything in the swallow family, the Eastern Phoebe, Eastern Bluebirds, and Scissor-tail Flycatchers. I don't know for certain which ones eat bees, but we have a wildflower field beside the house where there are lots of bees, butterflies, beetles of different varieties, ladybugs, and grasshoppers (and many more I'm sure).